• By improving the production techniques and providing specialized tooling equipments, such as jigs, fixtures, special tools, and gauges, the production cost have reduced considerably without sacrificing the accuracy and interchangeability of parts and components.

• To achieve the desired quality and quantity of production, the concept of accuracy and interchangeability go hand in hand.

• They play a major role in meeting the present day classes of engineering production, namely, "flow production" and "batch production".